Electronics Repair Questions? Ask an Electronics Technician
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You did well to wait a while for drying time before turning it On again.
(But, did you wait for days? or just hours or 1/2 a day? if so that may have been too little.)
If both remotes fail to work, without any sign that either one has a problem (and with fresh batteries correctly inserted in them, etc.), then the 'receiver' on the projector is most likely damaged. I would say that your projector needs service-repairing for this defect.